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Zainab Mazhari BB. Genotoxic Attribute of Bioconjugate of Tyr-AuNps Synthesized by Streptomyces tuirus DBZ39. Pak J Biol Sci 2021; 24:261-267. [PMID: 33683056 DOI: 10.3923/pjbs.2021.261.267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND AND OBJECTIVE Nanotechnology is a cumbersome field used in industrial, medical and environmental applications. Abundant information regarding the genotoxicity of gold nanoparticles is available, but limited information is available about the genotoxicity of enzymes and bioconjugates of gold nanoparticles from microbial sources. The present investigation reveals the genotoxicity of bioconjugate of tyrosinase and gold nanoparticles from Streptomyces sp. MATERIALS AND METHODS Tyrosinase and gold nanoparticles were isolated from Streptomyces tuirus DBZ39 and employed for the development of bioconjugates by the flocculation assay method. Methyl thiazole (MTT) assay, transmission electron microscopy, Dynamic Light Scattering (DLS) and UV-vis absorption spectroscopy were used for the investigation. RESULTS Bioconjugate showed a significant genotoxic effect at a concentration of 18 μL and at least 10 μL. Bioconjugate of tyrosinase and gold nanoparticles by Streptomyces tuirus DBZ39 revealed a more expressed genotoxic effect than nanoparticles alone. The efficacy of gold nanoparticles was expected to improve the bonding of tyrosine due to their catalytic properties. CONCLUSION This innovative concept of the application of Tyr-AuNps bioconjugate can be used for the development of powerful weapons in medicinal fields. The introduction of bioconjugates of enzymes and nanoparticles in the field of drug design and cancer imaging will be a fundamental breakthrough in medicine.
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Arlyapov VA, Kamanina OA, Kamanin SS, Reshetilov AN, Shvets VI. Monitoring of Biotechnological Processes by Enzyme Electrodes Modified with Carbon Nanotubes. APPL BIOCHEM MICRO+ 2019. [DOI: 10.1134/s0003683819030037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Raja M, Shelton JC, Salamat-Zadeh F, Tavakoli M, Donell S, Watts G, Vadgama P. An electrochemical study of acrylate bone adhesive permeability and selectivity change during in vitro ageing: A model approach to the study of biomaterials and membrane barriers. Anal Chim Acta X 2019; 2:100009. [PMID: 33117976 PMCID: PMC7587029 DOI: 10.1016/j.acax.2019.100009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 02/20/2019] [Accepted: 02/26/2019] [Indexed: 12/02/2022] Open
Abstract
This study assessed the solute permeability of a family of UV and moisture cured acrylates-based adhesives during in vitro ageing in pH 7.4 buffer. Acrylates have a potential role in bone fracture fixation, but their inability to allow microsolute exchange between the fractured bone surfaces may contribute to ineffective healing. Cyclic voltammetry and chronoamperometry were used to determine the diffusion coefficients for various electrochemically active probe molecules (O2, H2O2, acetaminophen, catechol, uric acid and ascorbic acid) at proprietary acrylic, urethane – acrylate and cyanoacrylate adhesives. All adhesives proved to be impermeable for up to 9 days ageing, following which a near-exponential increase in permeability resulted for all solutes. At 18 days, the diffusion coefficients were in the range of 10−5 cm2s−1 for O2 and H2O2 and 10−6 cm2s−1 for the organic solutes; no transport selectivity was seen between the latter. Adhesive joint strength showed a direct, inverse, correlation with permeability, with the more hydrophilic cyanoacrylates showing the greatest loss of strength. Adhesive permeabilisation does not appear to be compatible with the retention of bonding strength, but it serves as a new non-destructive predictor of adhesion strength change during ageing and practical use.
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Affiliation(s)
- M Raja
- School of Materials and Engineering Science, Queen Mary University of London, Mile End Road, London, E1 4NS, UK
| | - J C Shelton
- School of Materials and Engineering Science, Queen Mary University of London, Mile End Road, London, E1 4NS, UK
| | | | - M Tavakoli
- KTN LTD, Suite 220 Business Design Centre, 52 Upper Street, London, N1 0QH, UK
| | - S Donell
- University of East Anglia, Norwich Research Park, Norwich, Norfolk, NR4 7TJ, UK
| | - G Watts
- Liverpool John Moores University, Byrom Street, Liverpool, L3 3AF, UK
| | - P Vadgama
- School of Materials and Engineering Science, Queen Mary University of London, Mile End Road, London, E1 4NS, UK
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Subrizi F, Crucianelli M, Grossi V, Passacantando M, Pesci L, Saladino R. Carbon Nanotubes as Activating Tyrosinase Supports for the Selective Synthesis of Catechols. ACS Catal 2014. [DOI: 10.1021/cs400856e] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Fabiana Subrizi
- Department
of Physical and Chemical Sciences, University of L’Aquila, Via
Vetoio, I-67100 Coppito, AQ, Italy
| | - Marcello Crucianelli
- Department
of Physical and Chemical Sciences, University of L’Aquila, Via
Vetoio, I-67100 Coppito, AQ, Italy
| | - Valentina Grossi
- Department
of Physical and Chemical Sciences, University of L’Aquila, Via
Vetoio, I-67100 Coppito, AQ, Italy
| | - Maurizio Passacantando
- Department
of Physical and Chemical Sciences, University of L’Aquila, Via
Vetoio, I-67100 Coppito, AQ, Italy
| | - Lorenzo Pesci
- Department
of Ecology and Biology, University of Tuscia, Largo dell’Università, 01100 Viterbo, VT, Italy
| | - Raffaele Saladino
- Department
of Ecology and Biology, University of Tuscia, Largo dell’Università, 01100 Viterbo, VT, Italy
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Mohammad R, Ahmad M, Heng LY. An amperometric biosensor utilizing a ferrocene-mediated horseradish peroxidase reaction for the determination of capsaicin (chili hotness). SENSORS 2013; 13:10014-26. [PMID: 23921830 PMCID: PMC3812591 DOI: 10.3390/s130810014] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Revised: 07/27/2013] [Accepted: 08/02/2013] [Indexed: 11/17/2022]
Abstract
Chili hotness is very much dependent on the concentration of capsaicin present in the chili fruit. A new biosensor based on a horseradish peroxidase enzyme-capsaicin reaction mediated by ferrocene has been successfully developed for the amperometric determination of chili hotness. The amperometric biosensor is fabricated based on a single-step immobilization of both ferrocene and horseradish peroxidase in a photocurable hydrogel membrane, poly(2-hydroxyethyl methacrylate). With mediation by ferrocene, the biosensor could measure capsaicin concentrations at a potential 0.22 V (vs. Ag/AgCl), which prevented potential interference from other electroactive species in the sample. Thus a good selectivity towards capsaicin was demonstrated. The linear response range of the biosensor towards capsaicin was from 2.5-99.0 µM with detection limit of 1.94 µM. A good relative standard deviation (RSD) for reproducibility of 6.4%-9.9% was obtained. The capsaicin biosensor demonstrated long-term stability for up to seven months. The performance of the biosensor has been validated using a standard method for the analysis of capsaicin based on HPLC.
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Affiliation(s)
- Rosmawani Mohammad
- School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Selangor Darul Ehsan, Malaysia.
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Shing WL, Heng LY, Surif S. Performance of a cyanobacteria whole cell-based fluorescence biosensor for heavy metal and pesticide detection. SENSORS 2013; 13:6394-404. [PMID: 23673679 PMCID: PMC3690062 DOI: 10.3390/s130506394] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Revised: 04/10/2013] [Accepted: 04/16/2013] [Indexed: 11/16/2022]
Abstract
Whole cell biosensors always face the challenge of low stability of biological components and short storage life. This paper reports the effects of poly(2-hydroxyethyl methacrylate) (pHEMA) immobilization on a whole cell fluorescence biosensor for the detection of heavy metals (Cu, Pb, Cd), and pesticides (dichlorophenoxyacetic acid (2,4-D), and chlorpyrifos). The biosensor was produced by entrapping the cyanobacterium Anabaena torulosa on a cellulose membrane, followed by applying a layer of pHEMA, and attaching it to a well. The well was then fixed to an optical probe which was connected to a fluorescence spectrophotometer and an electronic reader. The optimization of the biosensor using several factors such as amount of HEMA and drying temperature were undertaken. The detection limits of biosensor without pHEMA for Cu, Cd, Pb, 2,4-D and chlorpyrifos were 1.195, 0.027, 0.0100, 0.025 and 0.025 μg/L respectively. The presence of pHEMA increased the limits of detection to 1.410, 0.250, 0.500, 0.235 and 0.117 μg/L respectively. pHEMA is known to enhance the reproducibility of the biosensor with average relative standard deviation (RSD) of ±1.76% for all the pollutants tested, 48% better than the biosensor without pHEMA (RSD = ±3.73%). In storability test with Cu 5 μg/L, the biosensor with pHEMA performed 11.5% better than the test without pHEMA on day-10 and 5.2% better on day-25. pHEMA is therefore a good candidate to be used in whole cell biosensors as it increases reproducibility and enhances biosensor storability.
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Affiliation(s)
- Wong Ling Shing
- Faculty of Science, Technology, Engineering and Mathematics, INTI International University, Nilai, Negeri Sembilan 71800, Malaysia
- Author to whom correspondence should be addressed; E-Mail:
| | - Lee Yook Heng
- Faculty of Science and Technology/South-East Asia Disaster Prevention Research Institute, University Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia; E-Mail:
| | - Salmijah Surif
- Faculty of Science and Technology, University Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia; E-Mail:
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Layer-by-Layer coated tyrosinase: An efficient and selective synthesis of catechols. Bioorg Med Chem 2012; 20:157-66. [DOI: 10.1016/j.bmc.2011.11.018] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Revised: 11/07/2011] [Accepted: 11/11/2011] [Indexed: 11/16/2022]
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Towards a reliable technology for antioxidant capacity and oxidative damage evaluation: Electrochemical (bio)sensors. Biosens Bioelectron 2011; 30:1-12. [DOI: 10.1016/j.bios.2011.08.036] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Revised: 08/11/2011] [Accepted: 08/25/2011] [Indexed: 01/05/2023]
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Villafiorita-Monteleone F, Canale C, Caputo G, Cozzoli PD, Cingolani R, Fragouli D, Athanassiou A. Controlled swapping of nanocomposite surface wettability by multilayer photopolymerization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:8522-8529. [PMID: 21635015 DOI: 10.1021/la2017402] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Single-layered photopolymerized nanocomposite films of polystyrene and TiO(2) nanorods change their wetting characteristics from hydrophobic to hydrophilic when deposited on substrates with decreasing hydrophilicity. Interestingly, the addition of a second photopolymerized layer causes a swapping in the wettability, so that the final samples result converted from hydrophobic to hydrophilic or vice versa. The wettability characteristics continue to be swapped as the number of photopolymerized layers increases. In fact, odd-layered samples show the same wetting behavior as single-layered ones, while even-layered samples have the same surface characteristics as double-layered ones. Analytical surface studies demonstrate that all samples, independently of the number of layers, have similar low roughness, and that the wettability swap is due to the different concentration of the nanocomposites constituents on the samples surface. Particularly, the different interactions between the hydrophilic TiO(2) nanorods and the underlying layer lead to different amounts of nanorods exposed on the nanocomposites surface. Moreover, due to the unique property of TiO(2) to reversibly increase its wettability upon UV irradiation and subsequent storage, the wetting characteristics of the multilayered nanocomposites can be tuned in a reversible manner. In this way, a combination of substrate, number of photopolymerized layers, and external UV light stimulus can be used in order to precisely control the surface wettability properties of nanocomposite films, opening the way to a vast number of potential applications in microfluidics, protein assays, and cell growth.
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Alessio P, Pavinatto FJ, Oliveira Jr ON, De Saja Saez JA, Constantino CJL, Rodríguez-Méndez ML. Detection of catechol using mixed Langmuir–Blodgett films of a phospholipid and phthalocyanines as voltammetric sensors. Analyst 2010; 135:2591-9. [DOI: 10.1039/c0an00159g] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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